Nop (00H); Figure 88. Nop Command (00H) - IBM IC35L020 - Deskstar 20 GB Hard Drive Specifications

15.10 NOP (00h)

Command Block Output
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
Error Register
7 6 5
CRC UNC 0
0 0 0

Figure 88. NOP Command (00h)

This command always fails with an error. The device responds with command aborted.
Output parameters to the device
Feature
The value of Sector Count, Sector Number, Cylinder High/Low, Device/Head set by host is not changed.
Registers
7 6 5 4 3 2 1 0
- - - - - - - -
V V V V V V V V
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
1 - 1 D - - - -
0 0 0 0 0 0 0 0
4 3 2 1
IDN 0 ABT T0N
0 0 V 0
Subcommand code
00H Abort any outstanding queue
01H–FFH Not abort any outstanding queue
Deskstar 60 GXP Hard disk drive specification
Command Block Input
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Status Register
0 7 6
AMN BSY RDY DF
0 0 V
122
Registers
7 6 5 4 3 2 1 0
- - - - - - - -
see below
Initial Value
Initial Value
Initial Value
Initial Value
Initial Value
see below
5 4 3 2 1
DSC DRQ COR IDX
0 – – 0 –
0
ERR
V